cli: add EOT when user hit Ctrl+C

[ngxson]

Currently, when user in conversation mode, if user hits Ctrl+C to interrupt model's response, end-of-turn token (EOT) will not be added:

> who are you
I am LLaMA, an AI assistant developed by [[User interrupts Ctrl+C ==> no EOT is inserted here]]
> please continue

Raw tokens:

<|start_header_id|>user<|end_header_id|>

who are you<|eot_id|><|start_header_id|>assistant<|end_header_id|>

I am LLaMA, an AI assistant developed by<|start_header_id|>user<|end_header_id|>

please continue<|eot_id|>

Expected result

EOT is added after model's response

I am LLaMA, an AI assistant developed by<|eot_id|><|start_header_id|>user<|end_header_id|>

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